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From the liner notes

Hot on the trail of a renegade Apache warrior, gun-slinging bounty hunter Mortimer passes through an 1849 California gold rush town, where local miners direct him into the mountains to track his prey. While he is gone, the miners unearth a meteor that has landed in their sleepy town. As they crack it open, an explosion releases toxic spores, which quickly infect the entire population, transforming them into blood–thirsty, mutant zombies. Following a ferocious battle, Mortimer triumphantly returns to town with his Indian captive in shackles only to find them surrounded by a ravenous horde of the undead. Now the two enemies must band together if they are to escape the horrors of The Dead and the Damned!